Friday, May 11, 2012

Liquid Layers

In order to learn more about Matter (solids, liquids, & gases) and the differences between liquids (density), we did a Liquid Layers experiment. You need: water, vegetable oil, shampoo, and syrup, plus a few items for the sink/float portion of the experiment.

Using a clear container, I poured in water first. We discussed what happens when oil and water mix. Next, goes in the oil, which settles on top of the water. Unlike another liquid, say milk, when mixed with water, oil and water do not mix. I even stir the two liquids to try to create a solution, but it just doesn't happen.

Next, goes in the syrup! The syrup, like honey or molasses, is a heavy liquid and sinks to the bottom of the container. This part is a favorite of the students! It is crazy to watch the syrup move through the oil and water to get to the bottom. Lastly, the shampoo is added to the liquid layers. The shampoo settles in between the syrup and water.

After we have created our liquid layers, we move to the sink/float part of the experiment! I gathered some classroom materials: a paperclip, coin, pencil grip, plastic square, and a pencil. As a group, we talked about each item and predicted to which layer it would sink. The students LOVED predicting and seeing if they were correct.